Abstract
In order to study the potential antioxidant defense mechanisms, the blackberry cultivar ‘Ningzhi 1’, a new floricane-fruiting hybridberry (Rubus sp.), was subjected to 20-day drought stress by withholding irrigation, followed by rewatering for 5 days, then the leaf water content (LWC), membrane electrolyte leakage, contents of photosynthetic pigments, protein, soluble sugar, hydrogen peroxide (H2O2), and MDA, activities of superoxide dismutase (SOD) and peroxidase (POD), and the levels of antioxidants such as ascorbate (AsA) and reduced glutathione (GSH) in leaves were investigated. The results showed that LWC was greatly decreased during the 20-day drought treatment period. After rewatering, water content restored. Drought stress induced significant accumulation of photosynthetic pigments, protein, soluble sugar, H2O2, and MDA as well as an increase in membrane electrolyte leakage, which were all decreased after rewatering. The activities of SOD and POD were elevated under drought stress, which were still at higher levels compared with control after rewatering. The contents of AsA and GSH ascended first and were then followed by a decline during the whole drought period, after rewatering, the contents increased and remained at a higher level than that of controls. The plants showed a rapid and almost complete recovery after rewatering, and the physiological alterations could represent a set of adaptive mechanisms employed by ‘Ningzhi 1’ to cope with drought stress. It was suggested that increased drought tolerance of ‘Ningzhi 1’ was due to higher antioxidant enzymes, reduced lipid peroxidation, better accumulation of osmolytes, and maintenance of tissue water content.
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Claims 11
Claim · model-written summary
Leaf water content fell greatly during the 20-day drought period.
RubusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LWC was greatly decreased during the 20-day drought treatment period.”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
Leaf water content recovered after rewatering.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After rewatering, water content restored.”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
Drought increased photosynthetic pigments, protein and soluble sugar.
- Treatment
- Drought stresse0
- Outcome
- photosynthetic pigments, protein, soluble sugare0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress induced significant accumulation of photosynthetic pigments, protein, soluble sugar, H2O2, and MDA as well as an increase in membrane electrolyte leakage, which were all decreased after rewatering.”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
Drought increased H2O2 and MDA.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress induced significant accumulation of photosynthetic pigments, protein, soluble sugar, H2O2, and MDA as well as an increase in membrane electrolyte leakage, which were all decreased after rewatering.”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
Drought increased membrane electrolyte leakage.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress induced significant accumulation of photosynthetic pigments, protein, soluble sugar, H2O2, and MDA as well as an increase in membrane electrolyte leakage, which were all decreased after rewatering.”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
Drought-elevated pigments, protein, sugar, H2O2, MDA and leakage decreased after rewatering.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress induced significant accumulation of photosynthetic pigments, protein, soluble sugar, H2O2, and MDA as well as an increase in membrane electrolyte leakage, which were all decreased after rewatering.”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
Drought elevated SOD and POD activity, which remained higher than control after rewatering.
- Treatment
- drought stresse0
- Gene
- SOD and PODe0
- Outcome
- activities of SOD and PODe0
- Direction
- elevatede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD and POD were elevated under drought stress, which were still at higher levels compared with control after rewatering.”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
AsA and GSH content rose initially and then declined during drought.
- Treatment
- drought periode0
- Outcome
- contents of AsA and GSHe0
- Direction
- ascended first and were then followed by a declinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of AsA and GSH ascended first and were then followed by a decline during the whole drought period”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
After rewatering AsA and GSH increased and remained above controls.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after rewatering, the contents increased and remained at a higher level than that of controls.”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
Plants recovered rapidly and almost completely after rewatering.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants showed a rapid and almost complete recovery after rewatering”
t0“blackberry cultivar ‘Ningzhi 1’”
Claim · model-written summary
Authors attributed drought tolerance to antioxidant enzymes, less lipid peroxidation, osmolytes and tissue water maintenance.
- Material
- ‘Ningzhi 1’e0
- Outcome
- increased drought tolerancee0
- Qualifier
- higher antioxidant enzymes, reduced lipid peroxidation, better accumulation of osmolytes, and maintenance of tissue water contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was suggested that increased drought tolerance of ‘Ningzhi 1’ was due to higher antioxidant enzymes, reduced lipid peroxidation, better accumulation of osmolytes, and maintenance of tissue water content.”
t0“blackberry cultivar ‘Ningzhi 1’”
The same questions in other papers
drought · physiology: antioxidant enzymes · Rubus (bramble)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
drought · physiology: water · Rubus (bramble)Results agree
1 paper in the same direction as this paper
- negative
drought · physiology: oxidative · Rubus (bramble)Results agree
2 papers in the same direction as this paper
- negative
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.